The Krell 402E is a great amp. I have the 403E which is three channel version and it’s a monster amp weighting in at 200 lbs. It’s a bit of hassle when it needs service. I recently had to send it for minor service and the shipping cost was more than the actual repair cost.
The amp sounds great with tube and solid state preamps. The CAST input sounds great and cables are much cheaper. I have used ARC Ref 5SE, Ref 6SE, Ayre KXR and Krell 707 pre/processor with my 403E and all sounded great. Be sure to give it plenty of space around the amp since it gets pretty hot.
Rich